Re: [ltt-dev] LTTng 0.87 improved page fault tracing

From: KOSAKI Motohiro
Date: Wed Jan 28 2009 - 22:43:17 EST



> I just combined the 4 page fault handler events that were in the tracing
> hot path of LTTng into 2 :
> kernel page_fault_entry
> kernel page_fault_exit
> They take as parameter the combination of what was available in the
> trap_entry/exit events and handle_mm_fault entry/exit events. This
> should lessen the performance impact of the tracer when it's active.
> I did the related modifications in LTTV 0.12.8.

Just question.

As far as I know, customer has two different requeremtn of the page fault.
(1) collect number of all page fault
-> if it is too large, too many interrupt decrease performance.
(2) collect number of major page fault
-> major page fault indicate to increase random access I/O,
then, some customer want to collect major page fault
(don't include minor page fault)

Is this patch fill (2) requirement?

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